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题名: Titanium species in titanium silicalite TS-1 prepared by hydrothermal method
作者: Li, G;  Wang, XS;  Guo, XW;  Liu, S;  Zhao, Q;  Bao, XH;  Lin, LW
关键词: titanium silicalite ;  TS-1 zeolite ;  titanium species ;  UV-VIS spectra ;  ESR
刊名: MATERIALS CHEMISTRY AND PHYSICS
发表日期: 2001-08-15
卷: 71, 期:2, 页:195-201
收录类别: SCI
文章类型: Article
部门归属: 5028
项目归属: 502
WOS标题词: Science & Technology ;  Technology
类目[WOS]: Materials Science, Multidisciplinary
研究领域[WOS]: Materials Science
英文摘要: The titanium species existing in titanium silicalite TS-1, which is prepared by hydrothermal method, were investigated using chemical analysis, XRD, FT-IR, Si-29 MAS NMR, UV-VIS, ESR. It has been observed that several kinds of titanium species may exist in titanium silicalite. The form that titanium atoms incorporate into the framework of titanium silicalite synthesized using tetrapropylammonium bromide (TPABr) as template differs from that using the classical method. But, the symmetry of titanium silicalite, changes from monoclinic to orthorhombic with the increase of titanium content in both methods. The Ti-O-2(-) originated from framework titanium and H2O2 has the moderate stability and may be active site in oxidation reaction. TS-1 synthesized using TPABr as template does not contain anatase, but contains a kind of partly condensed titanium species with six-fold coordination. The titanium species may correspond to 270-280 mn band in UV-VIS spectra and also can form Ti-O-2(-). But, this kind of Ti-O-2(-) is very stable and cannot be catalytic active site. So, the six-fold coordination titanium species may be inactive in both the oxidation reaction and the decomposition of H2O2. The hypothesis has been further proved by the phenomena that the titanium species is easily washed off using acid, and acid treating will not influence the catalytic performance of TS-1. (C) 2001 Elsevier Science B.V. All rights reserved.
关键词[WOS]: ELECTRON-SPIN-RESONANCE ;  CATALYTIC PROPERTIES ;  ISOMORPHOUS SUBSTITUTION
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000170475200013
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/92051
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Dalian Univ Technol, Lab Comprehens Utilizat Carbonaceous Resources, Dalian 116012, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Li, G,Wang, XS,Guo, XW,et al. Titanium species in titanium silicalite TS-1 prepared by hydrothermal method[J]. MATERIALS CHEMISTRY AND PHYSICS,2001,71(2):195-201.
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